Yeo One

Biography

Yeo Chang-gu (Korean: 여창구; born March 27, 1996), better known by his stage name Yeo One, is a South Korean singer and actor. He debuted as a vocalist in a South Korean boy group Pentagon in October 2016. Aside from group activities as singer, he has also starred in various television and web dramas.

Early life

Yeo One was born on March 27, 1996, in Daejeon, South Korea. He was a member of a school band and actively participated in band competitions.

Pre-debut

In December 2013, Yeo One participated in a special dance performance alongside future bandmates Hui, E'Dawn, and Kino at the KBS Song Festival. In 2014, Yeo One appeared in G.NA's "Secret" music video and promotional activities. In July 2015, he acted in Beast's Son Dong-woon's "Kimishika" music video. In August 2015, he modeled alongside Hyuna for the fashion brand Clride.n.

2016–present: Debut with Pentagon and solo activities

He took part on Mnet's reality survival program, Pentagon Maker, which aired online through Mnet's digital content brand M2. On October 10, 2016, he made his debut as a member of Pentagon on Mnet's M Countdown with the track "Gorilla" from their debut extended play, Pentagon. The song is described as a hip-hop song with magnificent, strong beats and masculine brass sound. During the show's filming, he made his acting debut with a lead role in web drama Spark as the leader of an idol group, Dexter. The series was a commercial success and attracted global fans.
In 2017, Yeo One was selected as the main character of KBS1 musical drama Joseon Beauty Pageant that set during the Joseon Dynasty's first beauty contest held. The drama also incorporates with traditional music with modern sensation and colorful images.
In 2019, Yeo One participated in reading the novel Youth, Beautiful Youth by Hermann Hesse through Naver Audio Clip Audiobook. He was confirmed to be the lead role in web drama, Welcome to the Witch Shop. The drama deals with fantasy elements that is based on the theme of witch shops that can only be visible to people with eager wishes.
In 2020, Yeo One returned to the small screen as a fictionalized version of himself on the TV Chosun entertainment drama Somehow Family. The show aired in March 2020, but was suspended after only two episodes due to the non-payment of staff. The show resumed filming in June but, due to scheduling conflicts, Yeo One was replaced by Shin Won-ho of Cross Gene. In August, Yeo One was cast as Nigel Bottom in the Korean adaptation of the comedy musical Something Rotten!. The play ran from August 7 to October 18. Later that year, he was the cover model for the September 2020 issue of Men's Health Korea.
In February 2021, Yeo One starred in the web drama Nickname Pine Leaf for the SBS YouTube channel yogurD, where he plays two different versions of himself: PD Yeo Chang-gu and Pentagon's Yeo One. He appeared on the cover of Men's Health Korea for the second time in November.
In August 2022, he appeared in the KBS2 drama If You Wish Upon Me. Later that year, he starred in the King Sejong Institute Foundation web series There is an Idol in my Living Room as a fictionalized version of himself.
On October 9, 2023, it was announced that Yeo One had left Cube Entertainment alongside fellow Pentagon members Yan An, Yuto, Kino, and Wooseok. Later that month, he announced his first solo fan concert, to be held on November 25, which sold out within one minute.
In January 2024, Yeo One joined the reality music competition show Build Up: Vocal Boy Group Survival. In February, he held his first Japanese fan concert.
After Yeo One's military discharge, he embarked on his first Asia tour in 2026. He released his first digital single "Run It Up" on February 11.

Health

In February 2022, Yeo One suffered a back injury after a car accident caused by a drunk driver. He temporarily withdrew from Pentagon's activities to recover. The following month, he and fellow bandmate Wooseok tested positive for COVID-19.

Military service

Yeo One began his mandatory military service on May 28, 2024. He was discharged on November 27, 2025.

Songwriting

All credits are adapted from the Korea Music Copyright Association, unless stated otherwise.